| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Research Abstract |
Blue light induces many adaptive responses in plants, including the phototropism. To clarify the mechanism of growth inhibition in response to phototropic response, the isolation and identification of various growth inhibitors (PRS : phototropism regulating substances) has been attempted. To understand the mechanism of growth inhibition induced by PRS, physiological and genetic analyses have been performed. We found that phototropic stimulation induces H_2O_2 accumulation via the up-regulation of PRS (e.g. 4-MTBI and raphanusanins in radish, DIMBOA and MBOA in maize). We also found that PRSs contribute to their growth inhibitory activity by promoting H2_O_2 synthesis and subsequent lignification, which could increase the stiffness at the primary cell-wall level. These results suggest a close association between an oxidative burst and phototropic curvature.
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